Vercel
Vercel design system as a DESIGN.md — monochrome Geist UI, electric-blue accent.
Real design systems for Cursor, Claude Code, Codex, shadcn/ui and more. Copy a DESIGN.md into your project — your agent generates UI that follows your real design rules, not generic defaults.
What is DESIGN.md? A plain-text design system file that AI coding agents read to generate consistent UI based on your project's real visual rules — colors, typography, spacing, and components.
Start with a ready-made template, learn the workflow in the DESIGN.md guide, or browse real design systems from products like Vercel and Linear.